Description
- Instant crystal growing kit
- Rocks grow at different heights, up to 4 inches
- Creates a brilliant underwater garden
Smithsonian Magic Rocks includes: 0.44 oz. (12.4 g) Metallic Salts, 2 x 4.5 fl oz. (133 ml) Sodium Silicate, 1 space background print, 1 sticker sheet, 1 tank and detailed instructions. Adult supervision required. Conforms to ASTM D-4236 Ages 10+